Electric reciprocating system for baby carriage

ABSTRACT

Electric reciprocating system for baby carriage, which is combined with external power source and carriage locating guide rail to simulate manually back and forth pushing/pulling movement. The system includes a base board, locating guide rail, two wheel guide rail gauge adjustment mechanisms and locking mechanism to form a linear moving path of the baby carriage. The driving unit includes a DC servomotor, a belt driving mechanism and a controlling circuit board for controlling and adjusting and the travel and speed. In cooperation with the driving pin and the linking ring fixed on the baby carriage rear beam, the system provides a reciprocating power for the baby carriage without power.

BACKGROUND OF THE INVENTION

[0001] The present invention is related to an electric reciprocating system for baby carriage. An external power source not directly mounted on the baby carriage cooperates with a specific locating guide rail to move the baby carriage back and forth along a linear path for domestically taking care of a baby.

[0002] A conventional baby carriage generally is not equipped any power source. Alternatively, a power supply may be mounted on the main body of the baby carriage. With respect to the former, it is laborious to use the baby carriage outdoors. With respect to the latter, it is strength-saving to use the baby carriage outdoors. However, when used indoors, the function of the baby carriage is still unpractical.

[0003] When using the baby carriage indoors, a baby is generally placed in the baby carriage which is pushed and pulled back and forth to help the baby to fall asleep. Such reciprocating movement is monotonous and laborious and it is impossible to take care other things when pushing and pulling the baby carriage back and forth. Therefore, it is necessary to develop an electric baby carriage which can be more conveniently used to save strength.

SUMMARY OF THE INVENTION

[0004] It is therefore a primary object of the present invention to provide an electric reciprocating system for baby carriage. An external power source is added to the baby carriage to save strength. The power source cooperates with a specific locating guide rail with adjustable rail gauge to move the baby carriage back and forth.

[0005] The present invention can be best understood through the following description and accompanying drawings wherein:

BRIEF DESCRIPTION OF THE DRAWINGS

[0006]FIG. 1 is a perspective assembled view of the structure of the present invention (direct driving);

[0007]FIG. 2 is a perspective exploded view of the main units of the present invention;

[0008]FIGS. 3A and 3B are perspective view and partially sectional view showing the operation principle of the rail gauge adjustment mechanism of the present invention;

[0009]FIG. 4 shows the operation principle of the driving unit;

[0010]FIG. 5 shows the structure of the pushcart; and

[0011]FIG. 6 is a perspective assembled view of the structure of the present invention (indirect driving).

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Please refer to FIGS. 1 to 6. The present invention includes five units, that is, a base seat unit 1, a locating guide rail unit 2, a driving unit 3, a baby carriage rear beam connecting unit 4 and a pushcart unit 5.

[0013] The present invention is driven by two ways as follows:

[0014] 1. direct driving: the power source directly drives the baby carriage to move back and forth (with reference to FIG. 1); and

[0015] 2. indirect driving: the power source drives a specifically designed platform cart which further drives the baby carriage to move back and forth (with reference to FIG. 6).

[0016] The assembly and function of the respective units are as follows:

[0017] The base seat unit 1 is composed of a base board 11, a latch button groove 12, two wheel guide rail gauge adjustment mechanisms 13, a locking plate 15 and a locking screw 16. A locating guide rail unit 2, the wheel guide rail gauge mechanisms 13 and a housing of a driving unit 3 are mounted and locked on the base seat unit 1.

[0018] The locating guide rail unit 2 is composed of a locating guide rail 21, a guide rail connecting screw 22 and a guide rail latch button 23. The locating guide rail unit 2 serves to linearly guide the wheels of the baby carriage when directly driven.

[0019] The driving unit 3 is composed of a driving housing 31, locking screw 32, DC servomotor 33, controlling circuit board 34, speed adjustment panel 35 and belt transmission mechanism 36. The driving unit 3 serves to supply power for the baby carriage and adjust operation properties (including travel and speed).

[0020] The rear beam connecting unit 4 is composed of an external auxiliary beam 41 and linking ring 42. The rear beam connecting unit 4 serves to transmit power from the driving unit 3 to the powerless baby carriage.

[0021] The pushcart unit 5 is composed of a pushcart seat 51, a front wheel assembly 52, rear wheel assembly 53, adjustable front stop block 54, locking button 55, fixed rear stop block 56 and adjustment slide slot 57. The pushcart unit 5 serves to retain and fix the baby carriage when indirectly driven.

[0022] As shown in FIG. 1, the baby carriage is back and forth movable along a fixed straight line by means of the locating guide rail 21 mounted on the base board 11. The wheel guide rail gauge adjustment mechanism 13 is mounted on the adjustment wing board 131 and cooperates with gears and racks to adjust the rail 21 to a position suitable for the wheel gauges of various types of baby carriages. After adjusted, by means of the guide rail latch button 23 and the cooperative latch button groove 12, the locating guide rail 21 can be locked.

[0023] The base board 11 is divided into a front and a rear blocks connected by a locking plate 15 and locking screw 16. A power source, that is, the driving unit 3 is mounted on the base board 11. The housing 31 and the entire internal mechanism of the driving unit 3 are locked on the face of the base board 11 by locking screw 32. A driving pin 365 projects from the opening of upper side of the housing for driving the baby carriage. Through the external auxiliary beam 41 and the linking ring 42 mounted on the rear frame of the baby carriage, the driving pin 365 is fitted in the linking ring 42. At this time, the wheels of the baby carriage are accommodated in the U-shaped recessed face of the locating guide rail 21 and can be truly reciprocally driven. This is the aforesaid direct driving.

[0024]FIG. 2 is a perspective exploded view of the present invention, including the base seat unit 1, locating guide rail unit 2 and the driving unit 3. The base seat unit 1 includes the base board 11 and the two wheel guide rail gauge adjustment mechanism 13 which will be further described with reference to FIGS. 3A and 3B.

[0025] The base board 11 is divided into inner guide rail mounting board 111 and outer guide rail mounting board 112. The former includes an inner wheel guide rail gauge adjustment mechanism 13 positioned on inner side. The latter includes an outer wheel guide rail gauge adjustment mechanism 13 positioned on outer side (with reference to FIGS. 3A and 3B). Left and right sides of the inner and outer wheel guide rail gauge adjustment mechanisms 13 are locked by upper and lower locking plates 15 and two locking screws 16.

[0026] The adjustment wing board 131 of the inner wheel guide rail gauge adjustment mechanisms 13 passes through the rack driving guide slot 134 to couple with the rack 133 disposed in the inner wheel guide rail mounting board 111.

[0027] The adjustment wing board 131 of the outer wheel guide rail gauge adjustment mechanisms 13 also passes through the rack driving guide slot 134 to couple with the rack 133 disposed in the outer wheel guide rail mounting board 112.

[0028] With regard to the locating guide rail unit 2, the locating guide rail 21 of the locating guide rail unit 2 is divided into inner and outer locating guide rails 211, 212. The former is mounted on the adjustment wing board 131 of the inner wheel, while the latter is mounted on the adjustment wing board 131 of the outer wheel. Both are locked by guide rail connecting screws 22.

[0029] Via the adjustment wing boards 131, the inner and outer locating guide rails 211, 212 are respectively inward or outward pushed/pulled to a correct wheel gauge. Then, by means of the guide rail latch button 23 and the cooperative latch button groove 12, the inner and outer locating guide rails 211, 212 can be independently located.

[0030] The housing 31 of the driving unit 3 is locked on the base board 11 by locking screw 32 with the driving pin 365 projecting therefrom to drive the baby carriage. The driving device mainly formed of the belt transmission mechanism 36 is accommodated in the housing 31 as shown in FIG. 4.

[0031]FIGS. 3A and 3B show the operation principle of the wheel guide rail gauge adjustment mechanism 13, in which the inner and outer wheel guide rail gauge adjustment mechanisms 13 have identical structure and operation principle and are denoted by the same numerals. Therefore, the inner wheel guide rail gauge adjustment mechanism 13 is exemplified herein. The inner wheel guide rail gauge adjustment mechanism 13 is an oppositely movable mechanism in which a pinion 132 is used to drive the symmetrical racks 133 on both sides to move in opposite direction. In actual operation, the adjustment wing boards 131 at two ends are adjusted at the same time to synchronously move inward or outward.

[0032] The precision of adjustment is variable in accordance with the space (or the pitch) of the teeth of the gear or the rack. The connecting pin 137 on lower side of the adjustment wing board 131 passes through the rack driving guide slot 134 to connect with the coupling holes 138 on two sides of the rack 133.

[0033] The pinion 132 is a gear the bottom end of which has a flange for supporting and preventing the rack 133 from suspending due to its own weight or eccentric load in longitudinal transmission. Also, the outer sides (the ends without any tooth) of the racks 133 near the center of the pinion 132 is limited by the flange in the base board 11 from transversely displacing, whereby the racks 133 are properly in contact with the pinion 132.

[0034] The pinion 132 is rotatable about the screw 135 locked on the base board 11. A washer 136 is disposed between the pinion 132 and the screw 135 for increasing the bearing area so as to reduce wearing of the flange face of the bottom of the pinion 132 and the retaining face of the screw.

[0035] The outer wheel guide rail gauge adjustment mechanism 13 has the same structure and operation principle as the inner wheel guide rail gauge adjustment mechanism 13.

[0036] About the driving unit 3, FIG. 4 shows the operation principle of the driving unit 3 which is enclosed by a housing 31. The driving unit 3 has three main sections, that is:

[0037] 1. power sect ion mainly formed of a DC servomotor 33 (including reducing mechanism);

[0038] 2. controlling section including controlling circuit board 34 and speed adjustment panel 35; and

[0039] 3. mechanism section mainly formed of the belt driving mechanism 36.

[0040] First, in power section, the DC servomotor 33 serves to output power of low rotational speed and high torque for driving the transmission mechanism in the driving unit 3.

[0041] Second, in controlling section, the controlling circuit board 34 utilizes digital control mode to achieve adjustment of travel and speed by means of the speed adjustment panel 35 to meet the requirement of the user.

[0042] Finally, in mechanism section, the belt driving mechanism 36 is the center of the entire driving unit 3. The driving toothed pulley 361 receives power from the output shaft of the DC servomotor 33 and the driving pin 365 transmits the power to the baby carriage.

[0043] The driving toothed pulley 361 is directly mounted on the output shaft of the DC servomotor 33. The driven toothed pulley 362 is mounted on the driven shaft 3610. Two ends of the shaft are provided with ball bearings 369 as retainers.

[0044] The driving slide block 364 and the left and right symmetric guide rods 367 form a linear sliding path, that is, the driving slide block 364 is slidable along the guide rods 367 in one dimension. Two ends of the guide rods 367 are connected with guide rod fixing seats 368. The driving slide block 364 is divided into upper and lower blocks. The upper block is connected with the driving pin 365, while a linear ball bearing 366 is disposed in each of two ends of the lower block. The upper and lower blocks are mated with each other to define a recess in which the toothed belt 363 is fastened and clamped. The upper and lower blocks are locked by locking screw 32. The driving slide block 364 actually receives the power from the toothed belt 363 and stably slides along the guide rods 367 through the linear ball bearings 366. By means of the driving pin 365, the reciprocal driving operation is achieved.

[0045]FIG. 5 shows the pushcart unit 5 in which the inner and outer wheels of the front and rear wheels 522, 532 respectively accord with the set wheel gauges of the inner and outer wheel locating guide rails 211, 212.

[0046] The left and right wheels of the front wheel assembly 52 co-use a wheel shaft, that is, the front wheel shaft 521. However, in order to lower the gravity center of the carriage seat main body 511 and ensure safety, with the diameter of the wheel reduced and the height of the wheel shaft lowered, the wheel shaft is independently designed, that is, each side has a rear wheel shaft 531. Accordingly, when driven, the rear wheel shaft 531 will not touch the housing 31.

[0047] The front and rear wheel shafts 521, 531 are respectively retained by front and rear wheel ball bearing seats 513 and 514.

[0048] A shaft-shaped linking fitting hole 512 is formed on the inner wall of top section of the carriage seat main body 511 for assembling and linking with the driving pin 365 and the pushcart unit 5.

[0049] Referring to FIG. 6, the wheels on the bottom of the pushcart unit 5 cooperate with the locating guide rail 21 to linearly move back and forth. The baby carriage is retained on the top platform. On the other hand, in order to more stably rest the baby carriage on the pushcart unit 5, the top is provided with adjustable front stop block 54, whereby the front and rear wheels of the baby carriage are limited between the front and rear stop blocks 54, 56.

[0050] When adjusted, the rear wheels of the baby carriage must be first rearward pushed to abut against the fixed rear stop block 56. Then the adjustable front stop block 54 is adjusted and moved along the adjustment slide slot 57 until tight abutting against the front wheels. Then the locking button 55 is turned tight to complete the location of the baby carriage.

[0051] The above embodiments are only used to illustrate the present invention, not intended to limit the scope thereof. Many modifications of the above embodiments can be made without departing from the spirit of the present invention. 

What is claimed is:
 1. Electric reciprocating system for baby carriage, comprising a base seat unit, a locating guide rail unit, a driving unit, a baby carriage rear beam connecting unit and a pushcart unit which form a baby carriage automatic pushing/pulling system with variable travel, said system being characterized in that: the base seat unit is composed of a base board, a latch button groove, an inner and an outer wheel guide rail gauge adjustment mechanisms, a locking plate and a locking screw, the latch button groove being disposed at one end of the base board, the base board including an inner and an outer guide rail mounting boards integrally connected by the locking plate and locking screw, an inner wheel guide rail gauge adjustment mechanism being disposed on the inner guide rail mounting board, an outer wheel guide rail gauge adjustment mechanism being disposed on the outer guide rail mounting board; a set of two adjustment wing boards are disposed on outer side of the wheel guide rail gauge adjustment mechanism, a connecting pin being disposed under a lateral side thereof, the connecting pin through a rack driving guide slot being respectively connected to retaining holes of the inner racks on both sides, by means of a pinion, the racks on both sides being driven in opposite directions, the pinion being fixed on the base board by a screw and a washer, whereby the upper ends of the adjustment wing boards can be independently or both held and adjusted left and right in accordance with the actual position of the inner wheels of the baby carriage; the locating guide rail unit includes locating guide rails, guide rail connecting screws and a guide rail latch button, the locating guide rail being formed with U-shaped recessed groove serving as a linear reciprocating path along which the baby carriage is moved back and forth, a rim of the wheel of the baby carriage and the locating guide rail defining therebetween a U-shaped recessed contact face, the depth of the U-shaped recessed groove being in a certain proportion to the diameter of the wheel so as to ensure the linear path and stability in moving of the wheel; the locating guide rail is divided into inner and outer locating guide rails which are respectively locked on the adjustment wing boards by guide rail connecting screws, after rail gauge is correctly adjusted, two ends being locked by means of the guide rail latch button and the latch button groove disposed at one end of the base board; the driving unit includes a driving housing, a locking screw, a DC servomotor, a controlling circuit board, a speed adjustment panel and a belt transmission mechanism, the driving housing enclosing the entire driving unit, the driving housing being locked on the base board by locking screw, a driving pin projecting from the slot of upper side of the housing for driving the baby carriage, the DC motor servomotor serving as a power source and linking with the belt transmission mechanism, the output shaft of the DC servomotor being directly connected with a driving toothed pulley and through toothed belt linked with driven toothed pulley, a driven toothed pulley riding on the driven shaft, two ends thereof being provided with ball bearings as retainers; a driving slide block is divided into upper and lower blocks locked with each other by a locking screw to clamp the upper side of the toothed belt., a pair of linear ball bearings being disposed in the lower block and horizontally left and right symmetrically arranged, two guide rods being fixed on guide rod fixing seat and serving as sliding path, the driving pin being mounted on outer side and passing through a slot of upper side of the housing to project outward, whereby when the DC servomotor operates, through the belt driving mechanism, the toothed belt is drawn back and forth to drive the driving slide block and driving pin; the controlling circuit board serves to control the relevant setting of the back and forth operation and the speed adjustment panel on outer side of the housing serves to turn on/off the power and adjust the travel and speed; the rear beam connecting unit includes an external auxiliary beam and a linking ring, the external auxiliary beam being mounted on a rear frame of the baby carriage to overcome the problem of compatibility of different types of baby carriages, the linking ring being mounted on the external auxiliary beam and fitted and linked with the driving pin so as to back and forth move the baby carriage; the pushcart unit includes a pushcart seat, a front wheel assembly, a rear wheel assembly, an adjustable front stop block, a locking button and a fixed rear stop block, the pushcart seat having a close profile and a top horizontal retaining face, the pushcart seat having an inner linking fitting hole for linking with the driving pin, the front wheel ball bearing seat being mounted in the cart seat main body for retaining the front wheel shaft of the front wheel assembly and connecting with the front wheel, the rear wheel assembly having a structure identical to the front wheel assembly, the front and rear wheel assemblies enabling the pushcart unit to stably run along the locating guide rail without adjusting the rail gauge; and an adjustable front stop block and a fixed rear stop block are disposed on front and rear sides of the top of the pushcart, the adjustable front stop block being provided with locking button, the baby carriage being directly rested on the pushcart seat, the rear wheels of the baby carriage abutting against the fixed rear stop block, then the adjustable front stop block being adjusted and moved along the adjustment slide slot until tight abutting against the front wheels, then the locking button being turned tight to stably locate the baby carriage on the pushcart seat which is driven by the driving pin to linearly move the baby carriage back and forth. 